Are retaining walls required to have a permit?

All retaining walls  require a permit. Note: Any retaining wall over 48 inches in height are required to have a permit and engineered plans and design.

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1. Is a permit required for a storage building or accessory building in a residential area?
2. When is a permit required?
3. How much does a permit cost?
4. Are retaining walls required to have a permit?